Payment systems Linkpoint +_ World Pay

I need to connect a couple of Agora carts to LinkPoint and World Pay systems. I also need one payment page where customers enter the amount and payment is processed.

The person taking the project should also give me a module to use to connect more carts to the same systems.

Please ONLY if you know how to do it. I have lost enough time and money with those who say yes and do NOT deliver.

I will not change the cart. I need the carts connected. Everything worked fine for 5 years and stopped working when I moved servers.

Please quote and delivery delays. I will give you a site to connect. You can do it on your server. If it works, you will transfer to our dedicated server, we will check it and pay afterwards. No objection to deposit in escrow on this basis.